Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:58 2012 Optimize a model with 397 rows, 89 columns and 794 nonzeros Presolve removed 127 rows and 0 columns Presolve time: 0.00s Presolved: 270 rows, 89 columns, 642 nonzeros Variable types: 0 continuous, 89 integer (89 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.366667e+01, 173 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.66667 0 85 28.00000 33.66667 20.2% - 0s 0 0 33.07692 0 84 28.00000 33.07692 18.1% - 0s H 0 0 29.0000000 33.07692 14.1% - 0s 0 0 32.59740 0 88 29.00000 32.59740 12.4% - 0s 0 0 32.11390 0 85 29.00000 32.11390 10.7% - 0s 0 0 31.93745 0 81 29.00000 31.93745 10.1% - 0s 0 0 31.86920 0 87 29.00000 31.86920 9.89% - 0s 0 0 31.79185 0 87 29.00000 31.79185 9.63% - 0s 0 0 31.75117 0 87 29.00000 31.75117 9.49% - 0s 0 0 31.69967 0 88 29.00000 31.69967 9.31% - 0s 0 0 31.67460 0 87 29.00000 31.67460 9.22% - 0s 0 0 31.67368 0 87 29.00000 31.67368 9.22% - 0s 0 0 31.67368 0 85 29.00000 31.67368 9.22% - 0s 0 2 31.67368 0 84 29.00000 31.67368 9.22% - 0s Cutting planes: Gomory: 1 Zero half: 41 Explored 31 nodes (1408 simplex iterations) in 0.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.900000000000e+01, best bound 2.900000000000e+01, gap 0.0%